Index

R. intranervatum

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. 'intranervatum x aurigerum'

Vireya Hybrid

R. intranervatum X R. aurigeranum ssp aurigeranum

Hybridized By: No hybridiser registered

R. 'intranervatum x Pink Delight'

Vireya Hybrid

R. intranervatum X R. 'Pink Delight'

Hybridized By: No hybridiser registered

R. intricatum

Species

Subgenus: Rhododendron
Section: Rhododendron
Subsection: Lapponica

R. 'Intrifast Group'

Rhododendron Cultivar group

R. intricatum X R. fastigiatum

Hybridized By: Lowinsky T.H.. Tittenhurst, Sunninghill, Bershire, UK, 1958

R. inundatum

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. invictum

Species

Subgenus: Rhododendron
Section: Rhododendron
Subsection: Heliolepida

R. 'Invitation'

Rhododendron Hybrid

R. 'Anita Dunstan' X R. 'Lem's Cameo'

Hybridized By: Barlup, Jim. Bellevue, USA, 1987

R. 'Invitation's Gift'

Rhododendron Hybrid

R. 'yakushimanum x lacteum' X R. 'Powder Snow'

Hybridized By: Barlup, Jim. Bellevue, USA, 2014

R. 'Iona Campagnolo'

Rhododendron Hybrid

R. 'Etta Burrows' X

Hybridized By: Round, J., 1986

R. 'Iona Cee'

Rhododendron Hybrid

R. 'Haida Gold' X R. 'Golden Star'

Hybridized By: Wright, H.R.. Courtenay, British Columbia, Canada, 1991

R. 'Iora'

Azalea Hybrid

? X ?

Hybridized By: Waterer, H. (Knaphill) | Woking, Surrey (Knaphill) | UK, 1958

R. 'Irby'

Azalea Hybrid

? X ?

Hybridized By: Pratt, M.C., 1986

R. 'Irene'

Rhododendron Hybrid

? X ?

Hybridized By: Guldemond, 1945

R. 'Irene Bain'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. 'May Day'

Hybridized By: Yeates, J.S., 1979

R. 'Irene Koster'

Azalea Hybrid

? X ?

Hybridized By: Koster & Co., 1925

R. 'Irene Stead'

Rhododendron Hybrid

R. 'Loderi Group' X R. 'Loderi Group'

Hybridized By: Stead, E.F., 1958

R. 'Irian Jaya'

Vireya Hybrid

R. viriosum X R. 'Pink Delight'

Hybridized By: Unknown

R. 'Iris Prizeman'

Rhododendron Hybrid

R. 'Jervis Bay' X R. 'China Group'

Hybridized By: Prizeman, G.J.N, 1974

R. 'Irish Cream'

Azalea Hybrid

R. 'George Lindley Taber' X R. 'Janet Rhea'

Hybridized By: Vines,R.C. | Amelia Island, Florida | USA, 1990

R. 'Irish Lass'

Azalea Hybrid

? X ?

Hybridized By: Frisbie, L.F. | Tacoma, Washington | USA, 1958

R. 'Irma'

Azalea Hybrid

? X ?

Hybridized By: Vervaene, D. | Ghent | Belgium, 1867

R. 'Irmelies'

Rhododendron Hybrid

R. 'Oudijk's Sensation' X R. 'Marinus Koster'

Hybridized By: Hachmann, Hans. Barmstedt in Holstein, Germany, 1962

R. 'Irohayama'

Azalea Hybrid

? X ?

Hybridized By: Japan | no hybridiser registration, 1918

R. 'Irresistible Impulse'

Rhododendron Hybrid

R. 'Mars' X R. 'Purple Splendour'

Hybridized By: Unknown

R. irroratum ssp irroratum

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Irrorata

R. irroratum ssp irroratum 'Caarse'

Rhododendron Species Selection

Selected By: Unknown

Subgenus: Hymenanthes
Section: Pontica
Subsection: Irrorata

R. irroratum ssp irroratum 'Polka Dot'

Rhododendron Species Selection

Selected By: Rothschild, Edmund Leopold de , Southampton , UK, 1957

Subgenus: Hymenanthes
Section: Pontica
Subsection: Irrorata

R. irroratum ssp irroratum 'Spatter Paint'

Rhododendron Species Selection

Selected By: Unknown

Subgenus: Hymenanthes
Section: Pontica
Subsection: Irrorata

R. irroratum ssp kontumense

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Irrorata

R. irroratum ssp pogonostylum

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Irrorata

R. irroratum ssp yiliangense

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Irrorata

R. 'Isaac Newton'

Rhododendron Hybrid

? X ?

Hybridized By: Unknown

R. 'Isabel Pierce'

Rhododendron Hybrid

R. 'Anna' X R. 'Lem's Goal'

Hybridized By: Pierce, Lawrence. Seattle, Washington, USA, 1975

R. 'Isabella Group'

Rhododendron Cultivar group

R. griffithianum X R. auriculatum

Hybridized By: Loder, G.H., 1934

R. 'Isabella Maria'

Azalea Hybrid

R. 'Carol Kitten' X R. 'Girard's Fuchsia'

Hybridized By: Klimavicz, J.F., 1998

R. 'Isadora'

Rhododendron Hybrid

R. degronianum ssp yakushimanum 'Koichiro Wada' X R. 'Cynthia'

Hybridized By: Heinje, D.. Jeddeloh, Germany, 1962

R. 'Isaphan Group'

Rhododendron Cultivar group

R. 'Fabia Group' X R. wardii var wardii

Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1941

R. 'Isar'

Rhododendron Hybrid

? X ?

Hybridized By: Unknown

R. 'Island Canoe'

Rhododendron Hybrid

? X ?

Hybridized By: Whitman, M.J.. Wall, NJ, USA, 1994

R. 'Island Echoes'

Rhododendron Hybrid

? X ?

Hybridized By: Whitman, M.J.. Wall, NJ, USA

R. 'Island Fire'

Rhododendron Hybrid

? X ?

Hybridized By: Whitman, M.J.. Wall, NJ, USA

R. 'Island Song'

Rhododendron Hybrid

R. 'Arthur Bedford' X R. 'War Dance'

Hybridized By: Whitman, M.J.. Wall, NJ, USA, 1993

R. 'Isola Bella'

Rhododendron Hybrid

R. fletcherianum 'Yellow Bunting' X R. dauricum 'Arctic Pearl'

Hybridized By: Brueckner, J.B.. Mississauga, Ontario, Canada, 1979

R. 'Isolde'

Azalea Hybrid

R. simsii var simsii 'Vittatum' X R. 'Alice'

Hybridized By: Morrison, B.Y. | Pass Christian, Mississippi | USA, 1949

R. 'It's Special'

Rhododendron Hybrid

? X ?

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA

R. 'Italia Group'

Rhododendron Cultivar group

R. 'Duke of York' X R. griersonianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1954

R. 'Itokurenai'

Azalea Hybrid

? X ?

Hybridized By: Unknown

R. 'Itty Bitty'

Azalea Hybrid

R. 'Elsie Lee x Dorsett' X R. 'Helen Curtis'

Hybridized By: Clagett, W.L. (Buck) | USA | Derwood, Maryland, 1996

R. 'Ivan D. Wood'

Rhododendron Hybrid

R. 'King of Shrubs x Fawn' X R. 'Dido Group'

Hybridized By: Coker, R.J. Mrs., 1979

R. 'Ivery's Scarlet'

Rhododendron Hybrid

R. arboreum ssp arboreum X R. ponticum

Hybridized By: Ivery, J.